v3.26.1
Derivatives - Schedule of Gains/(Losses) on Derivatives Associated with Interest Rate Risk Management Activities (Details) - Customer Interest Rate Contracts Hedging  - Hedging Instruments and Hedged Items:  - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Customer interest rate contracts        
Derivative Instruments, Gain (Loss) [Line Items]        
Gains (Losses) $ (40) $ 64 $ (61) $ 175
Offsetting upstream interest rate contracts        
Derivative Instruments, Gain (Loss) [Line Items]        
Gains (Losses) $ 40 $ (64) $ 61 $ (175)